Drill-pipe slip



Feb. 5, 1924. 1,482,693

" G. W. MOLLENBERG DRILL PIPE SLIP Filed-March 17, 1923 w 9 F, I!

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INVEN TOR.

M F 5 62076 WWW/9&0

Patented Feb. 5, 1924.

PATENT OFFICE.

GEORGE W. MOLLENBERG, OF HUNTINGTON BEACH, CALIFORNIA.

DRILL-PIPE SLIP.

Application filed March 17, 1923. Serial No. 625,797.

T all whom it may concern:

Be it known that I, GEORGE W'. MoLLnN- BERG, a citizen of the UnitedStates, residing at Huntington Beach, in the county of Orange and Stateof California, have in vented certain new and useful Improvements inDrill-Pipe Slips, of which the following is a specification.

My invention relates to drill-pipe slips to suspend drill-pipe andcasing in deep wells, and the objets are, first, to provide a slip thatmay be sharpened without cutting new teeth in the same, and second, to

provide a slip with inserted teeth that may be removed to be sharpenedor replaced by new teeth.

Further objects are to provide teeth for drill-pipe slips that aresimple in construction and easy to insert.

A still further object is to provide single teeth that may be removedindividually to be resharpened or replaced by new teeth.

I attain these objects by the arrangement illustrated in theaccompanying drawing, in which:

Figure 1 represents a sectional view on line 11 of Figure 2.

Figure 2 represents a part plan view of Figure 1.

Figure 3 represents an inside elevation of the drill-pipe slip.

Figure 4 represents a plan view of Fi ure 3.

Figure 5 rep-resents a sectional view on line 5-5 of Figure 3.

Figure 6 represents an enlarged sectional view of the teeth in Figure 5.

Referring to the drawings in which like characters of referencedesignate similar parts, the drill-pipe 1 is of a standard type as usedin drilling oil wells and the like, and the slips 2 are fitted insections around the outside diameter of the said drillpipe 1, thespiders 3 are secured in the turntable 4.- and hold the said slips 2,and the turntable -i is operatively mounted on a bed plate 9, and thegear-teeth 10 are meshed into a piniongear and power transmission means,not shown.

The teeth 5 are inclined outwardly from the bevel-sockets 11 up to thebevel-edges 7 with parallel inner and outer faces 12 and 13respectively, the bevel-edges 7 are formed on the upper-outer ends ofthe said teeth 5 adjacent to the drill-pipe 1, and the bevelsockets 11are formed on the lower-inner ends of the teeth 5 in the said slips 2,the flanges 14 are formed on the two outer-end portions of the teeth 5and are fitted into grooves 15 and the said grooves 15 are formed in thesaid slips 2, and the clamps 6 are secured to the two ends of the slips2 over the said flanges 141.

The slips 2 are employed when it is desired to suspend the drill-pipe lin the vvell when it is necessary to connect or disconnect the joint onthe top end thereof to another length of drill-pipe 1, and isaccomplished by lowering the said slips 2 between the spiders 8 and thesaid drill-pipe 1, as the same is being suspended from an overhead rigthe weight of the suspended drillpipe 1 is transferred to the slips 2and causes the bevel-edges 7 in the teeth 5 to close in on the saiddrill-pipe 1 by wedging (10m in the spiders 3, and the said teeth 5 arein turn held into position by the downward pressure of the suspendeddrill-pipe 1 by hearing into the bevel-sockets 11.

When it is desired to sharpen the beveledges 7 on the teeth 5, theclamps 6 are released from the slips 2 and the flanges 14 are then freedfrom the grooves 15 after the said slips 2 are removed from the spiders3, or the broken or worn out teeth 5 may be replaced by new teeth 5without loosening the remaining slip members.

Having thus described my invention what I claim is:

1. A set of drill-pipe slips of the class described, comprising a set ofsockets positioned in the said drill-pipe slips; grooves positioned inthe sides of the respective drillpipe slips; individual teeth sections,adapted to be inserted in the said sockets; flanges formed on the endportions of the said teeth, adapted to fit into the said grooves; aclamping means, adapted to hold the said flanges in the said grooves, asset forth.

2. A set of drillpipe slips of the class described, comprising a set ofindividual teeth members, adapted to be inserted in the inner portion ofthe said drill-pipe slips and to fit around a drill-pipe; a clampingmeans, adapted to hold the said set of teeth a set of individual teethmembers, adaptin the said drill-pipe slips; as set forth. ed to fit inthe said grooves; bevel-edges 3. A set of drill-pipe slips of the classformed on the u per-outer portion of the 10 described, adapted tosuspend a drill-pipe said teeth, as set orth.- 5 vertically in a well;in .comb'naition with e I testimony whereof I gifliggmy signature.

set ef}h0ri z0i 1te11-y inclihed gieeovesfl 1; tioned radially in thesaid dr1 1-pipe s ips; GEORGE W MOLIJENB'ERG.

